Cosima should be about 16 if she was human but because she's a different species, she's older than that.
Her long hair is tied up because she can't cut her hair with sharp objects, her hair is pretty tough to cut and can glow in the dark.
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Her species is called Galaxian (Based on an old game) and they're from space. They can live up for thousands of years and are known for their glowing hair and super strength.
